Cisco CCNP / BSCI Exam Tutorial: Introduction To Policy Routing

Policy routing is an important issue in your office exam, and a bit of politics routing & 39;, you know, at the current production of the networks. But what exactly is the policy routing?
Policy based routing, as a rule " as the policy of routing " is & 39; using the road to determine the trajectory d & 39; a package will take to its final destination. As you progress in your CCNP study and the CCIE (Cisco or a certification body), you will notice that traffic can & quot; marked by the policy & quot; routing to the different Service levels in different classes of traffic. (This is also the transportation and placement of various types of traffic in the different files d & 39; waiting time in the router so that the administrator & 39; a higher priority for the traffic of transfer.)
There are some basic rules of politics routing you should know:
Policy routing doesn & 39; T affect the determination of the packages, but not touching, is the path taken to get there.
Policy can shift traffic routing based on & 39; source IP address or & 39; destination IP address (with the use & 39 d & 39 ; an ACL extended).
Policy routing can be configured so that at the level of & 39; interface, or the & 39; worldwide.
Applying policy routing via an interface affects only the packages on the interface & 39;:
R2 (config) int s0
R2 (config-if) ip route-map policy CHANGE NEXT HOP
Applying policy aimed & amp , 39, the world-wide roadmap for the packages produced on the router and not to all received packets on all interfaces.
Whether the routing policy on & 39; interface on the packages created locally, or both, always with the command show ip policy to ensure that you are on the right track, the good cards d & ; amp; 39; interfaces.
R2 show ip policy
Interface route on the map
local CHANGE NEXT HOP
Serial0 CHANGE NEXT HOP
And here is the great directive to hold ....
If a package does not match any specific criteria d & 39; a roadmap, or not in a row, an explicit statement denying that the data are sent to the routing process and will be processed normally. If you do not want to d & 39; forwarding packets that are not consistent with the criteria of the roadmap " ", & 39; entire command must be used to determine the packages and ; amp; 39; l null0 interface. This set of commands should be the last line of control in the roadmap.
There are four possibilities to a set of cards, if the roads are in the course & 39;. L & 39; following example shows the entire & 39 d & 39; between them.
R2 (config) 29 access-list allows 20.1.1.1 host
R2 (config) 30 access-list allows 20.2.2.2 host
R2 (config) 31 access-list allows 20.3.3.3 host
R2 (config) access-list 32 allows host 20.4.4.4
R2 (config) route-map EXAMPLE 10
R2 Driving Licence (config-route-map) 29 match ip address
R2 (config-route-map) ip set next-hop 40.1.1.1
R2 (config -- Route-map) EXAMPLE route-map of 20
R2 (config-route-map) 30 match ip address
Assuming the timetable was for the 39 &; ethernet0 interface router, a package of source 20.1.1.1 dignity in the first line of the road map and his neighbor hop set to & 39; IP address 40.1.1.1.
A package source 20.2.2.2, that the next statement of the license (number 20). There is no & 39; nd & 39; shares listed, this package should be returned to the routing engine to a disturbance of the normal routing. All that traffic that is not with the two addresses are usually also transported - & 39; there were no measures that the Roadmap.
Perhaps we want to prevent that traffic from 20.3.3.3 and 20.4.4.4. We can have multiple statements in a single game road map, and have the packages to these two addresses to which & 39; bit bucket - l & 39; interface null0.
R2 (config) route-map EXAMPLE 30
R2 Driving Licence (config-route-map) 31 match ip address
R2 (config-route-map) 32 match ip address
R2 (config-route-map) set?

as-path code for a string BGP AS-way tag attribute
automatic automatic calculation of the value-DAY list
comm in BGP community-list (deletion)
community community BGP Attribute Set
dampening BGP road flap berth
default defaults d & amp , 39; information
extcommunity BGP attribute enlarged Community
interface starting
ip IP interface
level If specific information on importing & 39; preferred route
local preferably local BGP attribute path
metric metrics for a goal-
metric routing protocol type Objective metrics routing protocol BGP
origin code from
tag day target value for routing protocol BGP
weight weight of the routing table

R2 (config-route-map) set null0 interface
Any transport corresponding ACL 31 or 32 is to null0, To which he is, by the router. All traffic that does not match any of the Roadmap states returned to & 39; Routing Engine natural treatment.
Knowing routing policy and the manner of implementation & 39; are the core competencies for the success of the examination & 39; OIOS, win your CCNP, and is always more, especially in the current Market-l & 39; employment. Get practical exercises in a CCNA / CCNP lab d & 39; homepage or rack rental, with the theory of & 39; learning, and you are the & 39; letter and The & 39; application of the EU-routing in a very short time. awilda lina



Bookmark it: